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Condensed Consolidated Statements of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Revenue:        
Freight revenue $ 135,204 $ 132,961 $ 401,251 $ 389,081
Fuel surcharge revenue 35,639 35,466 106,810 107,678
Total revenue 170,843 168,427 508,061 496,759
Operating expenses:        
Salaries, wages, and related expenses 53,728 53,488 163,602 159,045
Fuel expense 46,540 48,601 141,734 145,174
Operations and maintenance 13,077 12,151 37,460 34,076
Revenue equipment rentals and purchased transportation 26,207 22,641 75,668 61,819
Operating taxes and licenses 2,780 2,863 8,215 8,297
Insurance and claims 6,887 8,155 22,647 23,886
Communications and utilities 1,363 1,201 3,899 3,576
General supplies and expenses 3,882 3,976 12,182 11,575
Depreciation and amortization, including gains and losses on disposition of property and equipment 10,497 10,706 31,137 31,251
Total operating expenses 164,961 163,782 496,544 478,699
Operating income 5,882 4,645 11,517 18,060
Other (income) expenses:        
Interest expense 2,386 3,056 7,636 9,929
Interest income (1)   (3)  
Other expense, net   (4)   (20)
Other expenses, net 2,385 3,052 7,633 9,909
Equity in income of affiliate 1,150 555 2,180 1,225
Income before income taxes 4,647 2,148 6,064 9,376
Income tax expense 2,674 1,146 4,159 4,764
Net income $ 1,973 $ 1,002 $ 1,905 $ 4,612
Income per share:        
Basic net income per share (in Dollars per share) $ 0.13 $ 0.07 $ 0.13 $ 0.31
Diluted net income per share (in Dollars per share) $ 0.13 $ 0.07 $ 0.13 $ 0.31
Basic weighted average shares outstanding (in Shares) 14,864 14,757 14,827 14,737
Diluted weighted average shares outstanding (in Shares) 15,043 14,807 15,023 14,773